Mold.



P. DICKINSON.

MOLD. I APPLICATION FILED NOV. 2, 1907.

Patented Nbv. 12,1912.

2 SHEBT$ SHEET l.

V F.'T. DICKINSON;

MOLD, APPLICATION FILED NOV. 2, 1907.

Patented Nov. 12,1912.

2 SHEETS-SHEET 2.

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it known that L FRAN T. Di'omxson; citizen thc llni'ted States; residing at Chicago, the count Cook zin d'tatate Illinois, have invented eertsiin new and useful Improvements in Molclsyof Will-Sllfi the thllowingg" a specification.

Te invention relates: te' nolds endpan '3 The i'hrention hes folr'its prineifp zil jolo 'g leets; the provision of e; niold having im prored means ctorsecm'i'ng'tlie properjrelarr tire hardness inveri'ous portions" of the article. garoiihrcecl, and theprovisionof a v siniiple term kit-mold capable of Producing e brake shoe liming the most desirable" distrihution of faces.

chilled and soft "Wearing sur Certain embodiments the invention as applied to .IKlDlClS- for "brake shoes ere illesf treted ind-theecoornpenying "drawings; whereini Figure 1 iso longitudinal sec'tion throegh 3 the center'of an empty mold; Fig. S5 is, a, diagrnnnietic face View or a hre-ke shoe east: in the meld-of Fig. 1 "aftersuch brake-shoe is Worn to e point corresponding to the line-i (Ir-(l in Figylfl igs is e t'aiisversesection through the lower half of the nioldo'f Fig. 1, with a shoe iii positioii'therei n, the section being taken at a position"correspond? longitudinal section through c moditi'ec'l form of mold Fig, ii is a detail of the insert used in the forurot' mold shown in Fig. t, Fig. 6 is a longitudinal section throughanother formof mold, end Figs. '2', 8, 9, 10 and ll are diagrammatic views showing the various Weys in which the c'hillhmeyi be.v .i

distributed over the face of the shoes by the use of nonconducting material in the roughened surfecces of the mold, in' which the shoes are cast. Fig. '12 is a transverse section through the lower half of the mold of Fig. 1, with, a shoe in position therein, the section being taken at a position, correspond ing to the line (ll-ii inFig. It; and Fig. 13 is a, transverse section through the lower half of the incl-(l of Fig. 4: with ashoe in position therein, the section being taken at a position corresponding to the line c--c of i at. 1 %he mold as shown in Fig. 1 for casting brake shoes, comprises an upper sand cope,

'3 ram iiime mwm:

nicirinsoiri or ol-rrczreoirnnrnorsi i 3 r l l i v i t n wm re PatentedNov.'12;=1912, it: "i 1 Application no: Norember 1997. Sorrel i ioi' mb ill. A

lindiailoiver metal the rnainl I portion of the casting, is carried; The sides of the r'netali'nold ,inember ordreg are pro: vid' ed with "three recesses, which recesses 1 'cerry thejsehd inser't s l, 2 and 3, so that the side surfaces of the mold consists pertly i of seiid-eiid pl rtlyof metiil. When the shoe is cast all those portions inithe lower mold member are chilled with-the exception of the side surfaces of. the shoe adjacent the inserts l,- 2 and 3, end's'uch 'por'tions of wince. ;of the shoe es eresufiiciently near to the sandinserts to be: efi'ecte'd thereby,"'When v a shoeiis ce'st in'this mold the entire wear- 'ing' fa e may 'li'ere a high chill; and consene tly be qliitej'hard, or it may be niodified 21's her'einafte rjset forth, but as theslioe is I 'wornfdown it will soonbe worn into the I -{regions adjacent the inserts 1;2 endfiwhere, ,i

" the cooling'oflthe casting was sloweri'and ,tlie weering face of th'e sh'oe will be 'corre; 'spondirigly' nodi'fiedns indicated diagren niati'cally in Fig. 2 ,[Iwhich shows theface of the shoe aftei-J the shoe ha's' been worn down The parts mzlrked '5 having. been adjacent inserts l,2and3 are softer than the parts marked 4,1which were, adjacent; E the metal edges oi' the inold, and of coursethe influenceof the sandlinserts isg'reatergit the edgesof tlIG ShdQSQ that the hardns s i of the meta'hinthe' face, Of'theshbe between the parts marked 5 5 increases ,as thedis tance from the edges increases. By this means a wearing face is securedhavmg:

"'tma pcint correspondihg to the line (i- -a in, I I Fig-1.;

areas of hard metal to prolongthe life of the shoe and areas of. softer 'metal to increase "the frictional qualities of the shoe.- Iliwill also be seen that as the shoe wezir's further and further disproportion of hard and soft metal varies for the reason that the areas of the modifying inserts 1, 2 and 3xvary.

Fig. 3 illustrates the shoe in-the metal mold, on the line b b of Fig; 1, the portion Sindicating the hard surface of the shoe and the portion 16 indicating the softer interior. If desired the surface l3 may be made corrugated as indicated'in Figi'l, and mm v 'vicled with a fire-proof material of low the corrngzitions and refractory, nmterialil'lfi maybe arranged in configurations A,A

f'zi'ebf the shoe is allowed to be chilled and the remainder rotectedfrom ra-pid coolin A2 A. and A such as those indicated in Fi si 8, 9, 10 and 11, whereby a portion of t e by fneans of t e refractory material, an rendered. less hard than the other portions of the face. The. coating in the corrugations may be made very thin, dependent {113011 the softness of the metal desired, and

1n.some cases-may constitutemerely a wash or spraycontaining the refractory material.

A modified form of mold is shown in Fi 4. /The construction here illustrateddi ers from that of Fig. 1 in that a soft iron insert 11 'isused adjacent the face of...the

shoe, and instead of the.inserts -1,-2 and 3 the insert 9 is provided, constitut'ing a portion of the upper mold member. .Jlhe portions marked 10 are the. metal sides of the lower' mold member, and the arrangement secures a chilling of the surfaces of the shoe at the end with the central portion softer by reason .of the sand sides 9.

In Fig. 6 still another modification is shown, the end 'portio'ns'12 corresponding to the portions; 10 in Fig. 4, but the insert shown in Fi 4 being omitted in'this form of device. llie surface. 13 is preferably corrugated and'may box provided either with a continuous covering of refractory material correspondmg. to that int-he-device of Fig.

sand sides, and by reason 0 .1, or the refractory material may be arranged I over the surface in" the form of one of the configurations shown in Figs; 7, -8, 9, I0 and 11. In .this fo'rmof mold theends of the shoe cast are chilled by reason of the metal sid'e portions. 12, while the centralportion is rendered softer reason of the the refractory material used upon the corrugated surface 13. In this form of mold, as well as thatof Figs. 1 and 4, the harder portions .ofthe face of the shoe are adjacent the center of the shoe, while the edges of the shoe are modified and rendered-softer by reason of thereof a sand. insert the sand glortions of the mold adjacent the t edges of e shoe.

Having thus described my invention and illustrated its use, whatI claim as new and desire-to secure by Letters Patent is the following 1. A mold com rising a metal mold member having a sur ace partially covered by a thin coating of a refractory material of low conductivity.

ber having a surface provided with a roughrising a metal mold them-- ened portion only partially covering it and adapted to retain a coating of material of IO low conductivity.

.5. A mold for brake shoes comprising a metal mold member of varying cross section from the bottom to the top of the side, Whercbythe chill in the face of the shoe decreasesfrom the center to the side of the shoe and. the character of Ute wearing surface of the shoe varies as it is worn away.

.6. A mold for brake shoes comprising a mold member having a roughened metal surface for forming the wearing face ofthe shoe, and a coatin' of refractory relatively non-conducting material partially covering such surface.

i .In testimony whereof Lhavc hereunto= signed my name in the subscribed witnesses. 1

' FRANK T. DICKINSON.

presence of the tw'o Witnesses ,PAUL CARPENTER,

G. W. CUNNINGHAM.

having in the side- 

